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Project page for (another) VW GTI/16v swap, Turbo Car: 1994 VW GTI Engine: ABA(8v)/9A(16v) ABA (8v) Engine block, crank, 60-2 trigger wheel. 9A(16v) Cylinder head. Built motor (forged pistons/rods) Garrett GT35R .81 a/r T4 turbo. Custom EC36/EC18 Wiring harness VEMS v3 webshop assembled ________________ '''Update''' Many, Many problems! * Twice, shortly after making a change in Megatune, the ECU "locks up" and causes the injectors to stay open and fuel pump to run, hydralocking the motor. In my case it cost me a USD $280 Bosch LSM11 O2 sensor!! Also new oil for the engine (twice), and several hours lost (work and sleep). - What could cause the ECU to do this? How can it be prevented? - After turning the power OFF for a few minutes, everything was fine the first time, however the second time I think the ADC chip was damaged. - I now have no 1) EGT 2) Launch Control stuck ON - I am using an external MAP sensor, how is this still working? * The wideband O2 readings are OK at idle and low engine RPM, but jumps around greatly at medium RPM and higher, making the sensor unuseable. The pumpzero_pw and Nernst values were used as supplied with the VEMS, and the sensor was calibrated to 20.9% O2. - What could be the cause for this problem? * of possible note is I used the Fuel Injector relay output (terminal 87, shared with fuel injectors and the FJO fuel injector driver, to power Pin #3 of the Wideband O2 Sensor. - possible interference by using injector power instead of 12v ignition? - To allow the car to be tuned, I used an analog input for my Autronic exhaust analyzer. I set the analyzer to 0-5v, 10-15 AFR so I could view the Megatune logs in voltage and add a "1" to get my AFR. However I could not do this after the ADC chip was damaged. * What does the "Map Multiplication" in Megatune do exactly? - I thought the pulsewidth would be multiplied "behind the scenes" and the fuel VE table would be "flat", but it is not working on this engine (VE value approx. 50% at 40 KPA, 200% at 250 kpa) * I found that the logic level Ignition output does not trigger an MSD ignition, I had to use a 12v power output. (I ended up changing the ignition to a coil pack using 2 12v drivers) * The car runs very well when it is running. The TPS Enrichments are not working well (often adds fuel on small throttle transitions) and I need to work on the startup a little. _____________________________ Car is up and running on VEMS Currently using 60-2 crank trigger only, semi batch fire injectors Rochester 1000cc injectors, FJO external Injector Driver unit VEMS 400 kpa External MAP sensor ___________________________________ VEMS #1724 Order Specs: Assembled v3.3 controller - 1-wire interface: no - Flyback: 30V flyback - ignition driver: 4 - Knock and EGT: yes - LCD connection: yes - MAP connection: offboard - primary_trigger: VR - secondary_trigger: HALL ______________________ Build notes: Board_version=v3.3 Serial_nr= 1724 pump-= 4.12V wbo2_pump_pw_zero=0x67 (103 decimal) wbo2_nernstdc_target=0x86 (134 decimal) pump+= +0.9mV/200 Ohm AREF=4.9V (C103=1nF, no D100)
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